Psychological risk factors for increased post-operative length of hospital stay following coronary artery bypass graft surgery.

To date, researchers have examined the role of psychological factors in longer-term adaptation to coronary artery bypass graft surgery (CABG), but few have investigated the role of such factors in the immediate post-operative period. Thus, the current study examined psychological risk factors for increased post-operative length of hospital stay in 119 consecutive elective CABG patients (100 men and 19 women). When controlling for operative/post-operative factors, medical factors accounted for 24.5% of the variance. However, pre-operative psychological factors accounted for a further 4.4% of the variance, with increased depression and lower PTSD symptomatology identified as significant independent risk factors for longer post-operative length of hospital stay. Hence, while post-operative length of hospital stay is largely determined by medical factors, psychological factors also influence this outcome. Further research is required to replicate the current findings and to determine the mechanisms through which these variables may act.